Zotac’s Nitro overclocking device is an external device that allows users to overclock the graphics card in real time without leaving the game or 3D application. The overclocking is done by simply pressing one of three keys located at the front of the device. The device will be able to overclock the GPU, memory and even the shader clock. Nitro device is connected to the PC via USB connection and allows overclocking of Zotac GeForce 7, 8, 9, and GTX 200 series cards.